Go To Edit>>Preference>>Performance>>Uncheck "Use Graphics Processor" If this does not solves the issue then,

With Lightroom closed

Navigate to

C:\Users\YourUserName\AppData\Roaming\Adobe\Lightroom\Preferences (Where AppData is a hidden/system folder so you may need to enter the folder name directly into your Explorer address bar or enable hidden/system folders in Explorer folder view options.)

Open the file LightroomPreferences.agprefs

Search for the line Use autobahn=True(Press CTRL+F)

Change it to Use Autobahn=False

Once Done save the File

Restart Lightroom

3. Also refer this link and update Graphics Processor if you use AMD card